ORIGINAL: flyingagin
You should be able to cycle it from fast rich to lean, not full out peaked at this point and then a rich lean to run steady at.
Break in for a ringed and a ABC type is way different. A rich 2 cycle is were I break ABC motors in at. Or you risk ruining the pinch.
I am sure others can better describe the methods.
I'm well versed in ABC/ABN/AAC vs. lapped iron/steel vs. ringed break-in, I just wasn't sure if it was too soon to bring it close to peak. I venture to guess 15,500rpm to be something close to peak if not a bit higher. This engine sounds a fair bit stronger than my Enya SS30 with a TT .46 muffler. I didn't peak that engine until it had a gallon on it, but that's a lapped iron/steel engine.